lodash

I am trying to determine if an array of JavaScript arrays contains duplicates. Is this possible? I am first trying to see if I can strip the duplicates out and then do an equality check but I cannot get past the first part. Here is what underscore returns: var arr1 = [[1,2], [2,3], [1,2]]; var arr2 = _.uniq(arr1); var arraysAreEqual = _.isEqual(arr1, arr2); console.log(arraysAreEqual, arr1, arr2); // true Jsbin: http://jsbin.com/vogumo/1/edit?js,console Anyone know of a way to determine if the array contains duplicate arrays? It's a little sloppy, but (possible) var arr2 = _.uniq(arr1,

I have an object with strings in it. filteredStrings = {search:'1234', select:'1245'} I want to return '124' I know that I can turn it into an array and then loop through each value and test if that value in inside of the other string, but I'm looking for an easier way to do this. Preferably with Lodash. I've found _.intersection(Array,Array) but this only works with Arrays. https://lodash.com/docs#intersection I want to be able to do this without having to convert the object to an array and then loop through each value because this is going to be potentially holding a lot of information and I

I'm trying to get all objects with matching id's from my students array and get other property values from them... For instance my array looks like this: const students = [ {id: 1, name: 'Cal', location: 'McHale' }, {id: 2, name: 'Courtney', location: 'Sydney Hall' }, {id: 1, name: 'Cal', location: 'Syndey hall' } ] So my expected output would grab all instances of id: 1. {id: 1, name: 'Cal', location: 'McHale' }, {id: 1, name: 'Cal', location: 'Syndey hall' } I'll eventually want to remove duplicate names and display in a list like so... (But that's down the line. For now I just want to grab

In the question Iterate a list as pair (current, next) in Python , the OP is interested in iterating a Python list as a series of current, next pairs. I have the same problem, but I'd like to do it in JavaScript in the cleanest way possible, perhaps using lodash . It is easy to do this with a simple for loop, but it doesn't feel very elegant. for (var i = 0; i < arr.length - 1; i++) { var currentElement = arr[i]; var nextElement = arr[i + 1]; } Lodash almost can do this: _.forEach(_.zip(arr, _.rest(arr)), function(tuple) { var currentElement = tuple[0]; var nextElement = tuple[1]; }) The

Say I have an array like this: [1, 1, 2, 2, 3] I want to get the duplicates which are in this case: [1, 2] Does lodash support this? I want to do it in the shortest way possible. You can use this: _.filter(arr, (val, i, iteratee) => _.includes(iteratee, val, i + 1)); Note that if a number appears more than two times in your array you can always use _.uniq . Another way is to group by unique items, and return the group keys that have more than 1 item _([1, 1, 2, 2, 3]).groupBy().pickBy(x => x.length > 1).keys().value() var array = [1, 1, 2, 2, 3]; var groupped = _.groupBy(array, function (n)

Say I have an array like this: [1, 1, 2, 2, 3] I want to get the duplicates which are in this case: [1, 2] Does lodash support this? I want to do it in the shortest way possible. You can use this: _.filter(arr, (val, i, iteratee) => _.includes(iteratee, val, i + 1)); Note that if a number appears more than two times in your array you can always use _.uniq . Another way is to group by unique items, and return the group keys that have more than 1 item _([1, 1, 2, 2, 3]).groupBy().pickBy(x => x.length > 1).keys().value() var array = [1, 1, 2, 2, 3]; var groupped = _.groupBy(array, function (n)

I'm trying to use the throttle method from lodash in a fonctionnal component, e.g.: const App = () => { const [value, setValue] = useState(0) useEffect(throttle(() => console.log(value), 1000), [value]) return ( <button onClick={() => setValue(value + 1)}>{value}</button> ) } Since the method inside useEffect is redeclared at each render, the throttling effect does not work. Does anyone have a simple solution ? you may(and probably need) useRef to store value between renders. Just like it's suggested for timers Something like that const App = () => { const [value, setValue] = useState(0) const

I'm using v4.11.0 . I would like sort objects based on milliseconds property. Here's the array : [ { "name": "bug12755.xml", "list": "bugs42", "start-date": "2015-09-14", "age": { "text": "7 months", "milliseconds": 18381227304 } }, { "name": "bug12922.xml", "list": "bugs42", "start-date": "2015-08-27", "age": { "text": "8 months", "milliseconds": 19936427304 } }, { "name": "bug13183.xml", "list": "bugs50", "start-date": "2015-08-27", "age": { "text": "8 months", "milliseconds": 19936427305 } } ] I'm missing something fundamental about the iteratee function. I have this but does not seem to